/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponents/Public/Selection/GeometrySelectionManager.h
a world-space bounding box for the active element selection
virtual bool GetSelectionBounds ( [FGeometrySelectionBounds](API\Plugins\ModelingComponents\Selection\UGeometrySelectionManager\FGeometrySelecti-_2) & BoundsOut ) const